Railways Technical Ability Fluid Mechanics and Machinery Question Bank Fluid Mechanics

  • question_answer   Which of the following equations are forms of continuity equations?                     
    (\[\overrightarrow{V}\]is the velocity and \[\forall \] is volume)
    1. \[{{A}_{1}}{{\overrightarrow{V}}_{1}}={{A}_{2}}\overrightarrow{{{V}_{2}}}\]                        
    2. \[1\frac{du}{\partial x}+\frac{dv}{\partial y}=0\]  
    3. \[\int\limits_{S}{\rho \overrightarrow{V}\,.\,dA+\int\limits_{\forall }{\rho \,d\forall =0}}\]
    4. \[\frac{1}{r}\,\,\frac{\partial \,\left( r{{v}_{r}} \right)}{\partial r}+\frac{\partial {{v}_{z}}}{\partial z}=0\]  
    Select the correct answer using the codes below:
    Codes:

    A) 1, 2, 3 and 4                 

    B) 1 and 2

    C) 3 and 4            

    D) 2, 3 and 4

    Correct Answer: B


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